Kornia Ebbighausen & Bockwinkel 2007
Creators
- 1. Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany.
Description
Genus Kornia Ebbighausen & Bockwinkel, 2007
Type species
Kornia citrus Ebbighausen & Bockwinkel, 2007: 143; original designation.
Diagnosis
Genus of the subfamily Prionoceratinae with a spindle-shaped conch in the juvenile stage and globular conch in the adult stage. Umbilicus almost closed in stages larger than 7 mm diameter, in the juvenile stage with raised umbilical edge. Growth lines strongly curved back from the umbilical margin, forming broad and deep ventral sinus.
Genus composition
Central Europe (Vöhringer 1960): Imitoceras sphaeroidale Vöhringer, 1960; Kornia fibula sp. nov.; Kornia acia sp. nov.
North Africa (Ebbighausen & Bockwinkel 2007): Kornia citrus Ebbighausen & Bockwinkel, 2007.
Remarks
The genus Kornia was introduced by Ebbighausen & Bockwinkel (2007) for very small specimens which are characterised by their spindle-shaped conch and conspicuous umbilical shape, thus differing strongly from all other known early Tournaisian ammonoids. Juvenile ammonoids with such a shape, however, occur repeatedly in the fossil record, as shown for the Late Viséan genera Goniatites de Haan, 1825 (Klug et al. 2016; Korn 2017) and Hibernicoceras Moore & Hodson, 1958 (Schmidt 1925; Korn 1988a).
Kornia differs from Globimitoceras, apart from the juvenile conch morphology, in the course of the growth lines, which are almost straight in Globimitoceras are, but in Kornia they have a very broad and deep ventral sinus.
Notes
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Prionoceratidae
- Genus
- Kornia
- Kingdom
- Animalia
- Order
- Goniatitina
- Phylum
- Mollusca
- Scientific name authorship
- Ebbighausen & Bockwinkel
- Taxon rank
- genus
- Taxonomic concept label
- Kornia Ebbighausen, 2007 sec. Korn & Weyer, 2023
References
- Ebbighausen V. & Bockwinkel J. 2007. Tournaisian (Early Carboniferous / Mississippian) ammonoids from the Ma'der Basin (Anti-Atlas, Morocco). Fossil Record 10: 125 - 163. https: // doi. org / 10.1002 / mmng. 200700003
- Vohringer E. 1960. Die Goniatiten der unterkarbonischen Gattendorfia - Stufe im Honnetal (Sauerland). Fortschritte in der Geologie von Rheinland und Westfalen 3: 107 - 196.
- Klug C., De Baets K. & Korn D. 2016. Exploring the limits of morphospace: Ontogeny and ecology of late Visean ammonoids from the Tafilalt, Morocco. Acta Palaeontologica Polonica 61: 1 - 14. https: // doi. org / 10.4202 / app. 00220.2015
- Korn D. 2017. Goniatites sphaericus (Sowerby, 1814), the archetype of Palaeozoic ammonoids: a case of decreasing phenotypic variation through ontogeny. Palaontologische Zeitschrift 93: 337 - 352. https: // doi. org / 10.1007 / s 12542 - 017 - 0366 - 4
- Schmidt H. 1925. Die carbonischen Goniatiten Deutschlands. Jahrbuch der Preussischen Geologischen Landesanstalt 45: 489 - 609.
- Korn D. 1988 a. Die Goniatiten des Kulmplattenkalkes (Cephalopoda, Ammonoidea; Unterkarbon; Rheinisches Schiefergebirge). Geologie und Palaontologie in Westfalen 11: 1 - 293.